Volume 4, Issue 6, Pages (December 2001)

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Volume 4, Issue 6, Pages 586-592 (December 2001) Lack of Germline Transmission of Vector Sequences Following Systemic Administration of Recombinant AAV-2 Vector in Males  Valder R. Arruda, Paul A. Fields, Ross Milner, Luanne Wainwright, Maria P. De Miguel, Peter J. Donovan, Roland W. Herzog, Timothy C. Nichols, Jaclyn A. Biegel, Mahmood Razavi, Mike Dake, Dale Huff, Alan W. Flake, Linda Couto, Mark A. Kay, Katherine A. High  Molecular Therapy  Volume 4, Issue 6, Pages 586-592 (December 2001) DOI: 10.1006/mthe.2001.0491 Copyright © 2001 American Society for Gene Therapy Terms and Conditions

FIG. 1 PCR amplification of rAAV null vector sequences from rabbit semen DNA. (A) PCR analysis for AAV null vector sequences in genomic rabbit DNA isolated from semen collected on days 7, 30, 60, or 90 following IM injection of 1 × 1013 vector genome per kg. Each lane represents a sample from an individual animal. Lane M, size marker. Standard controls consisted of 0 to 1 × 104 copies of AAV null vector mixed with 1 μg genomic rabbit DNA. (B) PCR analysis for a 700bp of rabbit growth hormone using genomic DNA extracted from rabbit semen following IM injection of 1 × 1013 vg/kg of AAV. A PCR product was obtained in all samples, and a “no added DNA” control (H) was negative. (C) Southern blot of PCR products amplified from rabbit semen as outlined in (A). The probe was a 3-kb fragment containing sequences from the β-galactosidase and neo genes in the null vector. Positive controls contained 0 to 1 × 102 copies of AAV null vector plasmid mixed with 1 μg genomic rabbit DNA. Molecular Therapy 2001 4, 586-592DOI: (10.1006/mthe.2001.0491) Copyright © 2001 American Society for Gene Therapy Terms and Conditions

FIG. 2 PCR amplification of rAAV null vector sequences from rabbit gonadal tissue. AAV null vector sequences are detected in genomic rabbit DNA from gonadal tissue. Lane M, size markers; NC, genomic DNA from noninjected rabbit; H, water. Each lane represents a sample from an individual animal; positive signals were detected in 3/3 at day 7, 2/3 at day 30, 2/3 at day 60, and 1/3 at day 90. Molecular Therapy 2001 4, 586-592DOI: (10.1006/mthe.2001.0491) Copyright © 2001 American Society for Gene Therapy Terms and Conditions

FIG. 3 Fluorescent in situ hybridization of AAV-null vector sequences. Testis sections from a rabbit injected with AAV-null vector (1 × 1013 vg/kg) and harvested on day 60 were cryosectioned (5 μm thickness (A) or 3 μm thickness (B)) and processed for FISH. Fluorescent images of sample stained with DAPI (blue) to delineate the nucleus and the hybridization signal (red) showed that the rAAV genome is located near the seminiferous tubule basement membrane (A) or intercellular space (B). (C) Muscle sections from an injected rabbit were harvested on day 30; the hybridization signal is located within the nucleus. (D) FISH signal is demonstrated on the vessel wall of a testis harvested on day 7 following AAV injection. Magnification, x400. Molecular Therapy 2001 4, 586-592DOI: (10.1006/mthe.2001.0491) Copyright © 2001 American Society for Gene Therapy Terms and Conditions

FIG. 4 IF staining for AAV capsid and for heparan sulfate proteoglycan in testis. Testes sections from rabbit injected with AAV-null vector harvested on day 7 were stained with an antibody specific for the intact AAV capsid (red). AAV particles are localized on the vessel wall (A) or basement membrane (C). Images obtained by confocal microscopy from cryosections staining with both anti-heparan sulfate proteoglycan antibody (green) and anti-AAV capsid (red) revealed that AAV colocalized with surface HSPG on the testis vessel wall (B) or basement membrane (D). Molecular Therapy 2001 4, 586-592DOI: (10.1006/mthe.2001.0491) Copyright © 2001 American Society for Gene Therapy Terms and Conditions

FIG. 5 AAV does not transduce murine germ cells. Human 293T cells (A), mouse fibroblast cell lines (STO cells; B), and mouse spermatogonia and Sertoli cell cocultures (C) are shown. All cultures were transduced with AAV-LacZ, and gene expression is shown by X-gal histochemistry in both human and mouse control cultures (blue cells in A and B). Neither Sertoli cells nor spermatogonia were found positive after 3, 5, or 7 d in culture. Spermatogonia are identified by anti-GCNA immunohistochemistry (red cells in C). Bar, 40 μm. Molecular Therapy 2001 4, 586-592DOI: (10.1006/mthe.2001.0491) Copyright © 2001 American Society for Gene Therapy Terms and Conditions